Chado (The way of Tea) is a Japanese cultural practice involving the preparation and serving of Matcha to a guest. Influenced by Zen Buddhism, it is based around 4 core principles: Harmony, Respect, Purity and Tranquility ( Wa, Kei, Sei and Jaku).

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Jaku or "tranquility", the fourth principle, is the result of following the first three principles of harmony, respect and purity.